mine in naoma, west virginia. a team of federal investigators is arriving to figure out what caused that deadly explosion. some of the men killed in the blast have already been found and buried. president obama ordered u.s. flags across west virginia to be flown at half-staff in honor of those miners. >>> nfl star ben roethlisberger will not face sexual assault charges in georgia because that man, the district attorney, made the announcement today having reviewed the evidence from investigators and made all the interviews and all the forensic examination. last month a 20-year-old college student accused the steelers' quarterback of sexual assaulting her at a nightclub in milledgeville, georgia. the d.a. said there are still questions about what happened that night but there's not enough evidence to prosecute mr. roethlisberger. >> everyone agrees that the victim was highly intoxicated due to consuming alcohol. one of the bodyguards guided the victim down a back hallway. mr. roethlisberger followed her down the hal